皮皮学，免费搜题
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【多选题】
包装机械费用主要是指（ ）。A.
包装机械的购置费
B.
包装机械的维修费
C.
包装机械的折旧费
D.
包装机械的使用费
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
M2不仅反映经济中的现实购买力，还反映潜在购买力
C.
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D.
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